BRODIX BB-3 XTRA heads have taken the conventional big block to the next level. These cylinder heads feature a valve angle that is rolled two degrees. The 3 XTRA is available in an Oval or Square port configuration, and both are offered in an out-of-the box version or completely CNC ported. The out-of-the-box version is available in two port volumes, 345 cc or 363 cc, both with CNC ported 119 cc combustion chambers, CNC bowls blended and ports matched, and flow over 436 cfm. The BB-3 XTRA CNC ported version is available in two port volumes, 366 cc and 380 cc. The 380 cc version flows over 440 cfm. The BB-3 XTRA CNC ported oval ports are available in three port volumes: 332, 351 and 365 cc. This wide range of port volumes allows the oval port to compliment virtually any engine combination available. Port shape, port velocity, and the latest technology have propelled these cylinder heads to the top of their class.